Definition of Average Result Processing Time (ms)

How is Average Result Processing Time (ms) calculated? I am seeing some strange numbers for this metric. This metric shows up under the SQL Java Agent backends. For example, one sample of this metric had a value of 311 seconds. However, I know that that the actual operation only took 5 seconds. So my question is... what is the 311 seconds? What is this metric useful for? We have Wily Java Agent version 8.2. Thanks for any info. Chinh